All Sanwa JLF are the same; some just have different prefixes to show what is added on.
Here the six variations listed in Sanwa Catalog ('07~'08):
JLF-TP-8 is Base JLF.
JLF-TP-8Y is Base JLF with the TP-MA (PCB) rotated 90.
JLF-TP-8T is Base JLF with JLF-P-1 (Flat Mounting Plate).
JLF-TP-8YT is Base JLF with the TP-MA (PCB) rotated 90 with JLF-P-1 (Flat Mounting Plate).
JLF-TP-8S is Base JLF with the TP-MA (PCB) rotated 90 with JLF-P-1S (S Mounting Plate).
JLF-TP-8Y-SK is Base JLF with the TP-MA (PCB) rotated 90 with JLF-CD (Shaft Cover).
Of course other variations can be done too:
JLF-TP-8-SK, JLF-TP-8T-SK, JLF-TP-8S-SK, JLF-TP-8YT-SK.
I’ll just add this for completeness, since it is JLF:
JLF-TM-8 can do; JLF-TM-8T, JLF-TM-8T-SK, JLF-TM-8S, JLF-TM-8S-SK.
JLF-TM-8 is model without PCB; uses four individual Microswitches.
Used in HRAP EX, HRAP EX SA; specifically JLF-TM-8T-SK-K.
The letters at the end just mean color.
B = Blue
DB = Dark Blue
G = Green
O = Orange
P = Pink
R = Red
VER = Vermilion
V = Violet
W = White
Y = Yellow
K = Black
K/DH = Black/Gray
The wobble before touching the Microswitch?
That is normal; it is called Deadzone.
And the piece is Actuator.
It is plastic, not rubber.
The Joystick in Mad Catz Street Fighter IV Arcade FightStick? Tournament Edition is actually JLF-TP-8YT-SK-W, not JLF-TP-8Y-SK-W.
Oh wow, I checked out the link above my Post.
Noticed that it is my Post.
It is same information I have in this one.
Thank you for linking it fokkusuhaundo.